Résultats de la recherche

1. Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from the Ross Sea

   Paper Title:  Age estimation and maturity of the ridge-scaled macrourid (Macrourus whitsoni) from ... the Ross Sea Abstract / Description:  Juveniles of the macrourid Macrourus whitsoni were collected by ... the NIWA research vessel Tangaroa during the BioRoss survey of the western Ross Sea and Balleny ... Islands in 2004. Intensive analysis of otoliths from these specimens greatly increased confidence in the ... 0.055 and t0 0.159 for females. Revised estimates of the mean total length-at- maturity (38.8 and 46.4 ... compares these results with those from the earlier studies. Revised estimates of age-at-maturity are also ... - and age-at-maturity A large dataset of observer-collected maturity observations from 1999 was used ... for each sex. The model’s slope was regressed through the origin. L50%x, the length at which 50% of ...

   Science Journal Paper : CCAMLR Science, Volume 13 (CCAMLR Science, Volume 13) : 291–303 : Auteur(s): Marriott, P.M., M.J. Manning and P.L. Horn

2. Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey appropriate for all targeted species? Notothenia rossii in the Atlantic Ocean sector – revisited

   already heavily fished at the beginning of the 1970s. The closure of the fishery for this species in 1985 ... are more or less evenly distributed over the area at the time of the survey. This assumption is ... Paper Title:  Is the attempt to estimate the biomass of Antarctic fish from a multi-species survey ... was one of the first conservation measures adopted by CCAMLR. Fish biomass within a CCAMLR subarea or ... species in Southern Ocean fi sheries. The species was already heavily fi shed at the beginning of the ... surveys that target a number of species, including N. rossii, at the same time. These surveys are ... area at the time of the survey. This assumption is violated in the case of N. rossii, which is non ... -species surveys has indicated a substantial recovery of N. rossii, either at South Georgia or off ...

   Science Journal Paper : CCAMLR Science, Volume 11 (CCAMLR Science, Volume 11) : 141–153 : Auteur(s): Kock, K.-H., M. Belchier and C.D. Jones

3. Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South Georgia shelf

   of fish feeding activity was also observed at night. Fishing during this period with bottom trawls ... had yielded almost no catches at all. The information obtained on vertical migrations of C. gunnari ... Paper Title:  Vertical migrations of mackerel icefish (Champsocephalus gunnari) on the South ... Georgia shelf Abstract / Description:  High values of coefficient of variation resulting from the ... trawling depth for mid water trawls was measured at the level of the trawl head-rope. Information from ... catches decreases abruptly from 13-14 to 2-8 tonnes per hour of fishing. At night, catches were usually ... 2.0 to 2.6 tonnes per hour of fishing. At sunrise, fish migrate to the bottom layers and catches ... again start to increase. The pattern of catch distribution for bottom trawls at various times of the ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/8 (Selected Scientific Papers, SC-CAMLR-SSP/8) : 3–14 : Auteur(s): Frolkina, J.A. and V.I. Shlibanov

4. Target strengths of Antarctic krill (Euphausia superba)

   Mean Volume Backscattering Strength of encaged aggregations of swimming krill have been measured at 38 ... Paper Title:  Target strengths of Antarctic krill (Euphausia superba) Abstract / Description:  The ... and 120 kHz in a sheltered bay at South Georgia. The results indicate that the Target Strength values ... Backscattering Strength of encaged aggregations of swimming krill have been measured at 38 and 120 kHz in a ... encaged, otherwise free-swimming aggregations of krill at 38 and 120 kHz. In anticipation of submitting a ... harbour of the abandoned, and sadly vandalized, whaling station at Stromness on the island of South ... stored on a BAS data logger at the end of each interval. 4.3 Calibration On-axis calibration with ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I (Selected Scientific Papers, SC-CAMLR-SSP/5 – Part I) : 265–279 : Auteur(s): Everson, I., D.G. Bone, J.L. Watkins and K.G. Foote

5. Detection and quantitative estimation of krill concentrations by hydroacoustic instruments

   capable of registering individual krill at a depth of 50–60 m while the vessel is in motion. According to ... theoretical calculations, the range of detection of individual specimens can be considerably increased at the ... Paper Title:  Detection and quantitative estimation of krill concentrations by hydroacoustic ... instruments Abstract / Description:  The limited capabilities of existing hydroacoustic instruments in ... individual krill at a depth of 50 - 60 m while the vessel is in motion. According to theoretical ... calculations, the range of detection of individual specimens can be considerably increased at the expense of ... spread over several miles and can be registered as one or a number of layers at different depths ... . At certain times of the year, krill aggregations stay close to the surface during daylight hours ...

   Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 123-139 : Auteur(s): Yudanov, K.I.

6. A potential feedback approach to ecosystem-based management: Model Predictive Control of the Antarctic krill fishery

   Control of the Antarctic krill fishery Abstract / Description:  CCAMLR aims to develop a feedback approach ... to aid ecosystem-based management (EBM) of Antarctic krill fisheries. It is important to assess ... and uncertain conditions typical of Antarctic marine ecosystems. This study used Model Predictive ... spatially resolved annual catch limits in response to estimates of the state of the system. It suggests that ... system when supplied with a sequence of annual area‐specific catches. At each time-step, the ... of population collapse in any one area remains at a plausible level, which is necessarily non-zero ... study therefore uses the following illustrative objectives: (i) with a probability of at least 90 ... - exploitation levels, (ii) with a probability of at least 90%, the area- specific biomasses of predators must ...

   Science Journal Paper : CCAMLR Science, Volume 20 (CCAMLR Science, Volume 20) : 119–137 : Auteur(s): Hill, S.L. and M. Cannon

7. Fishes of the Ross Sea Region – A field guide to common species caught in the longline fishery

   working on toothfish longline fishing vessels to identify the main species of fishes taken in the Ross Sea ... region of Antarctica. Technical terms are kept to a minimum, and identification features are mostly those ... species of crocodile icefishes (Channichthyidae), and cod icefishes (Nototheniidae). It does not cover all ... about the identification of some of the fishes, and taxonomic study (beyond the scope of this guide) is ... PHOTOGRAPHY AND COLLECTING SPECIMENS AT SEA FOR OBSERVERS AND RESEARCHERS 1. PURPOSE OF THE ... Roberts and Andrew Stewart from the department of fishes at the Museum of New Zealand Te Papa Tongarewa ... of the head in front of the operculum. 7 Pyloric caeca. Small tubes or sacs located at the rear ... . Located at the end, e.g., terminal mouth is located at the front of the head as opposed to a sub ...

   Document : Site Section: Publications

8. An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island

   (Champsocephalus gunnari) populations at Heard Island are developed from the results of four scientific surveys ... survey conducted at the end of the 1997 fishing season would allow for a catch limit on the Heard Plateau ... Paper Title:  An assessment of the mackerel icefish (Champsocephalus gunnari) off Heard Island ... Abstract / Description:  Assessments of the abundance and potential yield of the mackerel icefish ... and potential yield of the mackerel icefish (Clzanzpsocephalus guiznari) populations at Heard Island ... tonnes for Sliell Bank. An assessment based on the results of a survey conducted at the end of the 1997 ... to the numbers at age 2, using a natural mortality coefficient (M) of 0.4 (yr-l) (this is the mid ... , with a range of about two orders of magnitude. At South Georgia and Kerguelen it has been found that ...

   Science Journal Paper : CCAMLR Science, Volume 5 (CCAMLR Science, Volume 5) : 79–101 : Auteur(s): de la Mare, W.K., R. Williams and A.J. Constable

9. The use of predator-derived krill length-frequency distributions to calculate krill target strength

   krill sampled from the diet of predators to provide a length-frequency distribution of krill at times ... to gain important estimates of krill biomass at times of the season hitherto unavailable from ... Paper Title:  The use of predator-derived krill length-frequency distributions to calculate krill ... , i.e during logistic/resupply operations. This will allow a robust estimate of krill abundance to be ... length-frequency distribution of krill at times when it is possible to run automated shipboard acoustic ... -board data collection systems it will be possible to gain important estimates of krill biomass at times ... availability of krill to predators can change markedly over the course of the breeding season (Reid at al ... that most indices of predator performance usually reflect conditions over periods of at least a month ...

   Science Journal Paper : CCAMLR Science, Volume 8 (CCAMLR Science, Volume 8) : 155–163 : Auteur(s): Reid, K. and A.S. Brierley

10. Preliminary report on biological observations and exploratory fishing data collected in the South Georgia area during the 1985/86 cruise of MT Carina

    . Feeding intensity was rather low for all species at the beginning of cruise. A rapid increase in feeding ... in the South Georgia area during the 1985/86 cruise of MT Carina Abstract / Description:  A fish ... survey in South Georgia waters was undertaken from November 1985 to January 1986 as a part of the on ... -going fish stock monitoring program conducted by the Sea Fisheries Institute, Gdynia. Codends of two ... with the majority at stage Ill. Feeding intensity was rather low for all species at the beginning of ... October) and ended at the end of November/beginning of December because of low c.p.u.e. (Table 11). The ... fish examined in samples were at maturity stages from 11 to V. The prevailing number of fish were at ... maturity stage III (Figure 13). From December, an increasing percentage of gonads at stage IV in male ...

    Science Journal Paper : Selected Scientific Papers, SC-CAMLR-SSP/3 (Selected Scientific Papers, SC-CAMLR-SSP/3) : 65-97 : Auteur(s): Kreft, K. and J. Szynaka

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